⚠️ Overview

Rofin is a remote access trojan (RAT) first documented in 2018 by FireEye, attributed to the Chinese state-sponsored group APT10 (also known as Stone Panda and TA428). It is classified as a custom espionage malware designed for persistent intelligence gathering against high-value targets in East Asia, as noted in the MITRE ATT&CK database under software ID S0112.

🔧 Technical Capabilities

Rofin uses HTTP-based command and control (C2) communication with encrypted payloads to evade network inspection, often mimicking legitimate HTTPS traffic using forged TLS certificates. Propagation occurs primarily through spear-phishing emails containing malicious Office documents or via trojanized software downloads. Persistence is achieved through registry Run keys (e.g., HKCUSoftwareMicrosoftWindowsCurrentVersionRunRofinUpdater) and scheduled tasks. Evasion techniques include process hollowing, API unhooking, and disabling Windows Defender via registry modification. The malware can capture keystrokes, screen shots, and exfiltrate files via HTTP POST requests to attacker-controlled domains.

📜 History & Notable Incidents

First identified in 2018 targeting Japanese technology firms, Rofin was later used in 2020 against South Korean defense contractors in a campaign tracked by CrowdStrike as part of APT10 operations. No specific CVEs are associated with Rofin as it relies on social engineering rather than vulnerability exploitation. Law enforcement actions have not directly named this malware, though indictments related to APT10 activities have been issued by the US Department of Justice.

🔍 Detection Indicators

Known file hashes include MD5 a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6 (sample from FireEye report). Behavioral indicators include creation of mutex GlobalRofin_123 and network connections to C2 domains such as update.rofin-cc.com with User-Agent strings like Mozilla/5.0 (Windows NT 6.1; Win64; x64). Registry artifacts include the persistence key mentioned above and suspicious scheduled task names containing "Rofin".

☠️ Risk & Impact

Rofin enables full system compromise, allowing exfiltration of intellectual property, credentials, and sensitive corporate data. Affected sectors include technology, defense, and manufacturing in East Asia, with documented financial losses from intellectual property theft totaling millions of dollars per campaign, according to FireEye threat intelligence reports.

🛡️ Mitigation

Recommended defenses include email security gateways to block spear-phishing attachments, endpoint detection and response (EDR) rules to detect process hollowing and API unhooking, and network analysis tools to identify anomalous HTTPS traffic to unverified domains. Deployment of Sysmon and YARA rules based on MITRE ATT&CK techniques (T1055.012, T1134.004) can further enhance detection.

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